What is the primary focus of the MULTICOM frequency?

The primary focus of the MULTICOM frequency is indeed self-announcement by pilots near uncontrolled airports. This frequency serves as a means for pilots to communicate their intentions, positions, and movements to other pilots operating in the same vicinity, especially when there is no air traffic control service available. By using this frequency, pilots can enhance situational awareness for themselves and others, which helps prevent collisions and fosters more efficient operations at airports that do not have a control tower.

In contexts where air traffic control is not present, such as at uncontrolled airports, self-announcement is crucial because it allows pilots to convey their actions—such as taxiing, taking off, and landing—thereby providing important information to other pilots who might be in the area. This level of communication is particularly important in maintaining safety in these environments, where visual observation is the primary means of situational awareness.

The other options focus on different aspects of aviation communication. Communication between pilots and air traffic control pertain to controlled airspace operations, while advisories from the FAA about airspace are different functions related to regulatory communications. Emergency communications are essential but typically occur on designated emergency frequencies and do not encompass the broader self-announcement functions served by MULTICOM.